Coiling means for metal bands for the purpose of heat treating the same



Dec. 17, 194-0. wElssE 7 2,224,997

COILING MEANS FOR METAL BANDS FOR THE PURPOSE OF HEAT TREATING THE SAMEFiled April 12, 1938 By His Afforneys qu gr wua. an HN Patented Dec. 17,1940 PATENT OFFICE COILING MEANSFOR METAL BANDS FOR THE PURPOSE OF HEATTREATING THE SAME Ernst Weisse, Rackwitz, near Leipzig, Germany,'assignor, by mesne assignments, to Walther H. Duisbcrg, New York, N. Y.

Application April 12,1938, Serial N o.201,49'4

- In Germany April 22, 1937 3 Claims.

This invention relates to a method of and means for use in the heattreatment. of metal bands.

Metal bands, particularly such as have been produced by rolling, areheat-treated generally by rolling them up and annealing the rolled upbands in an annealing furnace or a salt bath. In such treatment it hasbeen found that the inner convolutions of the tightly wound band becomeheated much more slowly than the outer convolutions, and also that, whenthe annealing treatment is followed by quenching, the action of suchquenching on the inner portions of the rolled up band is adverselyaffected, or frequently even entirely suppressed,- by the slowconduction of heat. This slow conduction of heat is due not only to thelong path the heat has to travel, which may amount to 80 mm. and more,depending on the thickness of the reel, but also to the fact that, evenin the case of a tightly wound band, the very thin layer of stagnantair. always present between the individual convolutions, acts as aheat-insulator.

A further drawback in the method hitherto employed is that, when theannealed reel is quenched in water or oil, it is impossible to avoid theformation of spots on the interior portions of the rolled up band, dueto the uneven penetration of the quenching medium into the intersticesbetween the individual convolutions of the reel. This formation of spotsis, moreover, substantially intensified by the formation of steam, thecorrosive action of the locally highly superheated steam on the metalfrequently becoming unpleasantly noticeable.

The present invention aims at providing a method and a device whichenable the foregoing drawbacks to be avoided. I

To this end, according to the invention, the metal band to be subjectedto heat treatment is wound up into a reel with the interposition of twonarrow marginal strips of appreciable thickness and of such a form as topermit the flow of gas and/or liquid intothe gaps between the individualconvolutions of the roll, e. g. in the form of narrow strips ofcorrugated sheet metal. In this form the rolled up band is subjected tothe annealing treatment-and, on occasion, also 'to the subsequentquenching. The corrugated strips enable allparts of the band to beexposed uniformly to theiaction of heat in the annealing furnace orannealing salt bath, and during the subsequent quenching of the bandreel also permit uniform access of the a cooling medium to all parts ofthe band. In this manner the inconveniences hitherto arising due to theslow conduction of heat and the uneven access of the cooling medium areobviated.

The strips of corrugated sheet metal are preferably inserted whenwinding the band, and are advantageously of such dimensions and sodisposed that they cover only the narrow marginal portions of the bandwhich are anyhow cut oil of Fig.1; and

Fig. 3 is a cross section along the line CD of Fig. 1.

The metal band A, coming from the reel of the .band rolling machine (notshown in the drawing), first passes over a guide roller B and a brake Cinto a guide D, and from there on to a winding drum E. Between the guideD and the drum E is located a device F for correctly feeding andpositioning the corrugated strips H from two drums G. As can be seenfrom Fig. 3, the device F consists of a shaft 11, on which are slidablymounted two guide brackets b, which can be adjusted by means of setscrews in accordance with the width of the band. The guide brackets eachcarry a guide for the corrugated strips H winding oil from the drums Gand also a vertically disposed guide roller d guided by the edge of theband A, and a horizontally disposed guide roller erolling on the band A.

A specially designed drum E, as shown in Fig. 2, is preferably used forwinding the band A together with the corrugated strips H. The drumcorresponding to the width of the band. After the winding has beencompleted, the clamping pressure is released and the wound up reel,together with the rings h, is removed from the drum E and introducedinto the annealing furnace. The rings h then prevent the wound up reelfrom collapsing or'otherwise altering its shape under the action of thehigh temperature prevailing in the annealing fumace;

I claim:

1. An apparatus of the kind described, comprising rotatable means forwinding 9. metal band thereon into a reel, means for controlling theadvance of the metal band to said winding up means, a guide framecomprising two brackets in adjustably spaced relation to each other, aneye in each of said brackets facing said winding up means, horizontalrollers on each of said brackets adapted to suspend said frame from saidmetal band when moving while allowing said frame to retain a stationaryposition in relation to said winding up means, and vertical rollers oneach of said brackets, laterally coacting with the edges of said band soas to maintain said frame in a fixed position relatively to the crosssection of said moving band, at least two means for holding a stock ofmetal strips and delivering the same therefrom through the eyes in saidbrackets respectively, to said winding up means, said holding means andalso said guide frame being so disposed and arranged in relation to eachother and to said winding up means as to enable said strips to becomecontinuously interposed between the convolutions of the band formingsaid reel and at a predetermined distance from the edges of said band.

2. An apparatus of the kind described, comprising a drum for winding ametal band thereon and into a reel, a pair of ring members forsupporting said reel arranged on the drum in proximity to the edges ofthe band to be wound, a slit in said drum along a side-line thereof, ashaft disposed in and along said slit and eccentrically mounted in saiddrum so as to be adapted to be caused alternatively to protrude from andto be retracted into said drum, said shaft firmly holding said rings inposition on said drum when it protrudes from the drum, means forcontrolling the advance of the metal band and'further at least two meansfor holding a stock of metal strips and delivering the same therefrominparallel and in spaced relation to each other, to said winding upmeans, saidholding means being so disposed and arranged in relation toeach other and to said winding up means as to enable said strips tobecome continuously interposed between the convolutions of the bandforming said reel and at a predetermined distance from the edges of saidband.

3. An apparatus of the kind described, comprising rotatable means forwinding a metal band thereon and into a reel, means for controlling theadvance of the metal band, and further at least two means for holding astock of metal said strips to become continuously interposed between theconvolutions of the band forming said reel and at a predetermineddistance from the edges of said band.

ERNST WEISSE.

